Bucket-door-operating mechanism



- July 8, 1930. G. E. WEBB BUCKET DOOR OPERATING MECHANISM Original F iled Jun 15, 1927 4 SheetsSheet Y ,Jwvcnfoa; Geog; f- Webb- July 8, 1930. '5; E WEBQB 1,770,054

' BUCKET DOOR OIPERATINGYMECHANISM Original Filed June 15, 1927 4 Sheets-Sheet 3 Georg; fin/ebb- July 8, 1930. G. E. WEBB 1,770,054

BUCKET DOOR OPERATING MEGHANI SM Original Filed June 15, 1927 4 Sheets-Sheet 4 gwuento'c Geoye f. Webb.

Patented July 8, 1930 umreo STATES GEORGE E; WEBB, or MILWAUKEE, WISCGNSIN, ASSIGNOR r ,KOEHRING COMPANY,

or MILWAUKEE, Wisconsin, A CORPORATION B o nT-nooR-oPEnnTINe MECHANISM Original application filed June 15, 1927, Serial No. 199,042. Divided and this application filed August 23,

1928. Serial No. 301,467.

This application is a division of my copending application Serial No. 199,042, for

boom bucket control mechanism'for concrete distributing apparatus, filed June th, 1927,

and is directed particularly to a novel type of bucket door operating mechanism.

An important object in View is the provision of mechanism of this character which will operate to automatically open and close the bucket door coincident with certain op erations of the boom, but wherein the mechanism is dependent for automatic operation only on movement of the bucket along the boom, and is not associated in operation with the cable conventionally employed to cause backward and forward movement of the bucket along the boom. As a result of at taining the end just described, I am able to employ my new bucket door operating mechanism with any type of boomand bucket regardless of what mechanism is availed of for causing movement of the bucket along the boom. V

In carrying out my idea somewhat more specifically, I aim to include in the bucket door operating mechanism, a member which is adapted for cooperation with the boom to impart opening'and closing actions to the bucket door.

A highly important feature is the provision of a member as noted in the preceding paragraph, which is designed to cooperate with the boom upon movement of the bucket in only one direct-ion therealong. 'This is accomplished. in view of the conditions created by conventionaloperation of a paving machine embodying such a boom and bucket construction wherein a loaded bucket is moved outward along the boom to any desired point without depositing any of its contents on the road bed,.but immediately reverse movement is imparted to the bucket, my novel mechanism is operated by the member engaging the boom to open the bucket do or whereupon distributing action commences.

Upon the bucket reaching the inner end of the boom, certain instrumentalities there located operate to bring into operatlon the member which cooperates with the boom to' cause opening and closing movements of the v bucket door, and in this manner the bucket dooris automatically closed, so that the bucket 1s ready'to receive a fresh charge of mate rials. i y

In a practical embodiment of the inven tion this member which engages the boom,

takes the form of a friction wheel which normally is out of engagement with the boom. but which is brought into contact therewith when it is essential to automatically open or close the bucket door through the bucket door operating mechanism. I c y Y lVith these and other objects in view such as those surrounding theprovision of instrumentalities automatically bringing the friction wheel in engagement with the boom and the linkage between the friction wheel and door of the bucket being shown in its openv position and as it is about to be tripped for closing just prior to the return of the bucket to the inner. end of theboom.

Figure 3 is an enlarged view of the parts.

of the bucket door operating mechanism in- V cluding the friction wheel actuator which is disposed in a position assumed at the com PA NT; OFFICE mencement of the closing movement of the door. 7, I

Figure 4: is a detailed perspective view of the rotatable friction wheel used in conjunction with the door operating mechanism, together with a trip pawl included therein and an associated trip lever, and

Figure 5 is a view somewhat similar to Figure 3 showing the position taken when the door is fully closed and the bucket returned id itsinnermost limit of movement on the boom.

While a preferred'specific form of the invention is herein setforth, it is to be understood that I am not tobe limited to the exact "constructions illustrated and described, because various modifications of these details may benprovidedin putting the invention into pr ctice within the purviewofthe appended claims. 7

Throughout the various'ifigures of the.

drawing and the following description, like i parts.

a a C is carried hythe mixer and conhectedthere reference" characters denote corresponding A portion ofthe mixing drum is shown fragmentar lyat Aiand is rotatably mounted on the frameworkB of the mixer.' A boom copending' application previously referred to, of which th s case is a division. It is not thought'necessary to'here go into the detailed 7 description of the driving mechanism for causing. movement of the bucket'along the boom, as this-is fully set forth in the-said parentapplication. t suflices to say that suitable gearing associated with the mixing drum A and framework B causes continuous operation of an endless cable E which has two ,reacheslextendingalongthe other face of the boom, one moving inone direction, and one in the other as is obvious. Vhen it is desired to have the bucket move outward, the carriage E is clutched to one reach of the cable ,and whenthe reverse movement is required, the carriageis clutched to the other reach.

Thebucket D is provided with aswing door 1 suspended from two arms, 2 and 3, and weighted at its upper edge as shown at 4 to provide a counter-balance. The rear edge of 4 the bucket openingfor which the door 1 is a closure, has secured thereto a flexible scraper 5 as clearly shown in Figure 2, which functions to remove any material tending "to adiere to thesurface of the door as it swings to "f'to open position, and further insures tight closure when the door swingsto closed positl'on. ,To the arm 2 1S: Qaffixed an actuating rod 6 having at its'point of connectlon with the arm 2 a v'cu'shionin s Diill 7 within a casin 7 t! a 52 e-separts constitute an adjustable connection with the arm for insuring proper closing ofthe door over the bucket opening. Referring o Figure 2,- it is noted that the arm 3 is aflix'e'd to the bucket D by a pin and slot connection as shown at 3 The rod 6 is connected at its other end with acrank arm 9 carried at the end of a shaft 10 which iis j ournaled in a hearing 11 on the forwardfwtill of the bucket; A crank arm 12 ex- "te11dsjfr0m the central portion of the shaft 10 and is connected bya link in the form of the vertically disposed rod 13 with a crank arm 14 carried by a short shaft 15 journaled in the outer end of a supporting lever 16 which in turn'is pivoted at 17 in a hollow head casting of the bucket D. A spring 18 co operates withthe inner end of the lever 16 to yieldably hold the shaft 15 at its so-called elevated position which is determined by an adjustable stop screw 19;

VUpon the shaft 15 is drivably mounted a friction wheel 20, the periphery of which is provided with interruptions or opposing flats A 21 and 22. These flats are formed in the peripheral portion of the wheel which may be comprised of any suitable'friction material. Interlocked with the shaft 15 and wheel is a trip lever 23 extending in opposed relation with respect to'the crank arm 1%. It is the function of this friction wheel 20 to cooperate iii-contact with the under surface of the'boom Gas the bucket J travels therealong and by its rotative movement" engendered by this engagement to automatically shift thebucket door 1 either to open or closed position as will now be more clearly set forth.

Assum'ethat the distributing bucket has deposited its contents upon the surface and under power of the mechanism causing movement of the bucket along" the boom, is returning towards the innerv end of the boom so as to receive another charge of material. With reference to Figure 2 ofthe drawings, it will be noted that the trip'lever 23 is in its upper vertical position andin its path-of movement lies a trip arm 24 carried by the boom and depending therefrom. It is notable that at this time the flat 22 is uppermost and slightly spaced from the boom so that the Wheel 20 is out of engagement therewith and stationary; Immediately the trip lever 23 impinges the arm 24:, the shaft 15 is rotated in its bearing, causingthe true periphery of the wheel 20 to contact with the boom as shown distinctly in Figure. 3, marking the initiation of the closing movement of the bucket door, the rotary motion of the wheel being transmitted through the parts 15, 14C, 13, 12,10, 9, and 6 to the door lever 2. I

When the wheel has rotated so far that the flat 21 reaches the uppermost positio nit will then be spaced from the boom, and turning action ceases and the door is in its closed position. Thislast described rotation of the wheel'20 brings a one-way actuating pawl 25 carried by the wheel 20, into cooperative relation with the boom with which it has, under certain conditions, biting engagement. The bucketis now charged with another load of material and then by means of the driving mechanism for the bucket,'it is moved outwardly along the boom until a desired point is reached, whereupon movement of the bucket is reversed, In the outward movement of the bucket, the pawl 25 simply operates along the surface of the boom without any. operative effect, but coincident with reverse of the travel, the pawl bitingly engages the boom, 7 p

the door is not being operated.

thereby initiating rotation of the wheel 2-0 sufficiently to bring the true periphery thereof lnto contact with the boom, and the continuation of the inward travel of the bucket causes further rotation of the wheel 20 which moves the bucket door into open position such as shown in Figure 2, whereby the contents of the bucket are distributed on a road bed. Immediately the bucket door reaches the inner end of the boom, it is automatically closed as previously described.

So as to insureproper operation of the bucket door operating mechanism, certain safety instrumentalities are provided which will now be described. Pivotally mounted on the head of the bucket D adjacent the wheel 20 is a safety friction stop 26 which permits free movement of the wheel 20 in one direction but which functions to prevent any reverse of such movement which might possibly allow the wheel 20 to accidentally operate reversely to the desired direction, as will be clearly understood.

Inasmuch as the inward movement of the bucket not only'deposits prepared concrete on a road bed but also distributes the same, I have provided for a variable opening of the bucket door. To this end the crank 9 and its connection with the rod 6 are formed with a series of apertures 27. The number provided in the illustrated construction will permit of three different degrees of the opening of the door such as shown in full and dotted line positions of Figure 2 of the drawing. i

The door 1 has the movement in the plane of its body or that of the opening of the bucket which closes, also as it floats, so to speak, into and from closing positions there is caused slight movement lateral to such plane. This insures tight closing especially when the latter movement is obtained by the linkage mounting of the door and the greater length of the arm or link 3 as compared with that of the arm or link 2.

Having thus described my invention, what I claim as newand desire to secure by Letters Patent of the United States, is

1. In combination, a boom, a bucket, a carriage therefor to traverse said boom, means to move the bucket outwardly and inwardly of the boom, a door forsaid bucket, and means to positively operate the door from the boom to open and close the same including a member which travels both along the boom and in contact therewith during door open-' ing and closing operations.

2. In combination, a boom, a bucket to traverse said boom, meansto move the bucket outwardly and inwardly of the boom, a door for said bucket, and means to operate the door from the boom including a member which-travels on the boom during door opening and closing operations and means for interrupting such travel during periods when 3. In combination, a boom, a bucket to traverse said boom,means to move the bucket outwardly and inwardly of the boom, a door for said bucket, and means to operate the door from the boom including a member which travels on the boom when the door is operated, mechanismoperatively connecting said member to the. door, and means coopcrating with the boom to initiate such travel for both opening and closing operations.

4-. In combination, a boom, a bucket, a carriage therefor to traverse said boom, means;

to move the bucket outwardly and inwardly of the boom, a door for said bucket, and

means to operate the door from the boom in-;

cluding a rotatable member which travels on the boom during opening and closmg operations of the door, mechanism opera-v tively connecting said member to the door, means on the boom to 1n1t1ate one of said ,movements, and means on the member 'to initiate ther of said movements.

5. In combination, a boom, a bucket to the traverse said boom, means to move the bucket outwardly and inwardly of the boom,

door for said bucket, and means tooperate the door from the boom including a fricticn wheel mounted to travel with the bucket and having peripheral flats interrupting contact with the boom, a crank shaft carry ing said wheel and connected-to the door,

trip means. for actuating said shaft to initiate contact of the wheel with the boom to operate the door in one direction, and separate means'to shift the wheel to operate the door in the opposite direction. I

6. In boom bucket door operating mechanism of the class described, the combination of a bucket and support therefor, a door for said bucket swingingly supported on said bucket, a rotatable actuating member, a yieldable support for said actuating member, means for adjusting said support to dispose the actuating member in cooperative relation to the bucket support, a shafton which said actuating member is mounted, connections between said shaft and the bucket door, and a trip member connected with the shaft for shifting the actuator from inoperative position to cooperative position with relation to the bucket support. I

7. In combination, a boom, a carriage to traverse said boom, a bucket swingingly supported from said carriage, a door for said bucket, operating means for said door comprising a friction wheel disposed adjacent the boom, a crank shaft on'which said wheel is mounted, a yieldable support in which said shaft is journaled, connections between said shaft and the bucket door, a trip lever connected to said shaft, a trip arm on the v 4 V 1 1,770,054. a

boom with which saidtrip lever is'adapted to cooperate to shift the wheel into cooperation with the boom, said wheel having peripheralinterruptions to prevent contact of 4' the wheel with the boom except. when it is desired to actuate the bucket door. 8, In a concrete paver, a: distributing bucket having adischarge opening, a door toopen and close the opening, linkage loosely sustaining the door for floating movement approximately in-the plane of the opening, and an actuating member resiliently Y connected to the linkage to insure proper to the door but having a sliding p1n connecclosing of the door.

9. In a concrete paver, a distributing bucket having a discharge opening, adoor for said opening, means to operate the door, and means to clean thedoor as it moves relatively to'theopening, and including a part intermediate the door and bucket to form a tightclosure therebetween when" the door is closed, I i

l0. Mechanism ofthe class described, comprising, in combination, a receptacle having a'discharge opening, a door movable into and out of positions closingsaid opening, means for mountingsaid door to allow for said operation, consisting of an arm' pivotally mountedon the bucket and pivotally fastened to the door, and a second arm pivoted 7 tion with the bucket. I

11. 'Mechanism of the class described, com-V prising,'in combination, a receptacle having a discharge'opening, a door movable into and out of posit-ions closing said opening, means for'mounting said door to allow for said v operation, consisting of an arm pivotally mounted on thebucket and pivotally fastened to the door, a second arm' pivoted to the door but having a sliding pin connection with the bucket, and means for operating said connection to said first named arm.

12. In combination, a boom, a bucket, a carriage therefor, means to move the bucket and its carriage outwardly and inwardlyof theboom, a door for said bucket, a member rotatable in only one direction for both opening and closing the door, and mechanism operatively connecting said member to the door. I

Intestimony whereof I aflix my signature. 7

V ononon n. WEBB. 

